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Species Profile

Green Tree Python

Morelia viridis

Coiled like a leaf, strikes like lightning
iStock.com/tane-mahuta

Green Tree Python Distribution

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Close-up view of a green tree python (Morelia viridis). The snake has a very distinguishable diamond-shaped head.

At a Glance

Wild Species
Also Known As Green tree snake, Green python, Tree python, Jungle python
Diet Carnivore
Activity Nocturnal+
Lifespan 12 years
Weight 2 lbs
Status Least Concern
Did You Know?

Adults are typically 1.2-1.8 m total length; large individuals reach ~2.0 m (species accounts in major field guides; Reptile Database).

Scientific Classification

An arboreal python known for its bright green adult coloration (often with white/yellow dorsal markings) and a characteristic coiled resting posture on branches. Juveniles are frequently yellow or reddish/orange and change color as they mature.

Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Pythonidae
Genus
Morelia
Species
viridis

Distinguishing Features

  • Arboreal lifestyle; often rests in tight coils over branches
  • Adults typically vivid green; juveniles often yellow or red/orange before color change
  • Heat-sensing labial pits typical of pythons
  • Laterally compressed body suited for climbing

Physical Measurements

Males and females differ in size

Length
459 ft 4 in (393 ft 8 in – 590 ft 7 in)
5 ft 7 in (4 ft 11 in – 6 ft 7 in)
Weight
2 lbs (2 lbs – 3 lbs)
4 lbs (3 lbs – 5 lbs)
Tail Length
12 in (8 in – 1 ft 4 in)

Appearance

Primary Colors
Secondary Colors
Skin Type Dry, smooth, glossy overlapping keratin scales (non-keeled appearance); enlarged ventral scutes (belly scales) for gripping branches; visible heat-sensing labial pits along the lip scales (typical pythonid facial pit organs).
Distinctive Features
  • Arboreal Green Tree Python (Morelia viridis) often rests in tight 'saddle' coils draped over a branch, with its head centered on the coils and tail wrapped around as an anchor.
  • Body form: laterally compressed, slender trunk with a clearly prehensile tail adapted for climbing and branch stability.
  • Head and eyes: relatively large, triangular head distinct from neck; vertical slit pupils; labial pits evident along the upper/lower lip scales (heat-sensing).
  • Typical adult total length: commonly ~1.2-1.8 m; large individuals can approach ~2.0 m total length (reported in major references such as Barker & Barker 1994; O'Shea 2007).
  • Lifespan: commonly ~15-20+ years in captivity; wild longevity is less precisely documented but generally considered shorter/unknown (reported in widely used husbandry/encyclopedic sources; e.g., Barker & Barker 1994; O'Shea 2007).
  • Found in New Guinea (and nearby islands) and far northeastern Australia (Cape York). Local groups may vary in green shade and amount of dorsal spots but are still Morelia viridis, not other tree pythons.

Sexual Dimorphism

Sexual dimorphism is present but subtle: females average larger and heavier-bodied than males, while males often have proportionally longer tails and more prominent pelvic spurs. Differences are most apparent in mature adults and are commonly used alongside probing/hemipenal evaluation in scientific/husbandry contexts.

  • Often slightly smaller overall adult size on average (shorter and lighter-bodied than females in many populations).
  • Proportionally longer tail beyond the cloaca; pelvic spurs often appear more prominent (typical for many pythonids).
  • Typically larger overall adult size and more robust girth, especially when mature.
  • Shorter proportion of tail length relative to total length; body often appears thicker through midsection when adult.

Did You Know?

Adults are typically 1.2-1.8 m total length; large individuals reach ~2.0 m (species accounts in major field guides; Reptile Database).

Hatchlings are often yellow or red/orange and commonly shift to green as they mature (ontogenetic color change), usually within the first 6-24 months (Barker & Barker; herpetological husbandry literature).

A classic resting pose is a tight "saddle" coil over a horizontal branch, with the head centered and ready to strike-excellent camouflage among foliage.

It's a python (egg-laying) and not the South American emerald tree boa, which is a boa (live-bearing).

Juveniles tend to eat more lizards and frogs; adults more often take birds and small mammals-an age-related diet shift common in arboreal snakes.

Heat-sensing labial pits help it detect warm-blooded prey in low light, supporting its mostly nocturnal ambush lifestyle.

Unique Adaptations

  • Labial heat pits (infrared-sensitive) for detecting warm prey in darkness-key for nocturnal arboreal hunting.
  • Laterally compressed body and strongly prehensile tail improve stability and maneuvering on narrow branches.
  • Long, recurved teeth aid in gripping birds and other prey that could otherwise escape from an elevated perch.
  • Ontogenetic color polymorphism (juvenile red/yellow → adult green) likely reduces predation risk and/or matches different microhabitats used at different life stages.
  • Cryptic adult patterning: green background with white/yellow dorsal markings breaks up body outline among leaves and sun-flecked canopy light.

Interesting Behaviors

  • Arboreal "sit-and-wait" ambush: perches motionless on branches at night, striking rapidly at passing prey; by day it remains tightly coiled for concealment.
  • Signature branch-roosting coil ("saddle posture"): body draped over a branch in one or more loops with the head poised in the middle-reduces silhouette and supports quick forward strikes.
  • Ontogenetic color change: many individuals transition from red/orange or yellow juveniles to green adults; the timing varies by individual and locality (documented broadly in captive and field observations).
  • Age-related prey shift: smaller, slender juveniles often target ectotherms (e.g., lizards), while larger adults more frequently take endotherms (birds/small mammals), reflecting changing gape size and hunting opportunities.
  • Reproductive brooding: females lay clutches (commonly reported ~6-30 eggs in species references) and coil around them through incubation, guarding and stabilizing conditions typical of pythons (Barker & Barker; general python reproductive biology).

Cultural Significance

The green tree python (Morelia viridis) is an iconic rainforest snake of New Guinea and Australia's Cape York. Used in conservation education and reptile keeping to show living in trees, camouflage, color change with age, and confusion with the South American emerald tree boa.

Myths & Legends

The species name means "green," referring to the bright adult color early European naturalists noted. It was once placed in its own genus, but many modern sources put it with carpet pythons.

In northern Australia and parts of New Guinea, Indigenous and local stories often tell of large rainforest or water snakes; the green tree python (Morelia viridis) is linked to this wider 'rainforest snake' motif.

Modern herpetoculture lore: since late-20th-century captive breeding expanded, distinct island/locality color forms from New Guinea became the subject of detailed naming traditions among keepers and breeders-an example of contemporary, community-based storytelling attached to this species.

Conservation Status

LC Least Concern

Widespread and abundant in the wild.

Population Unknown

Protected Under

  • CITES Appendix II (international trade regulated; includes Morelia viridis)
  • Australia (Queensland): protected native wildlife under the Nature Conservation Act 1992 and associated regulations (take/keep/trade controlled via permits)

Life Cycle

Birth 14 hatchlings
Lifespan 12 years

Lifespan

In the Wild
10–15 years
In Captivity
15–25 years

Reproduction

Mating System Polygynandry
Social Structure Solitary
Breeding Pattern Seasonal
Fertilization Internal Fertilization
Birth Type Internal_fertilization

Behavior & Ecology

Social Solitary Group: 1
Activity Nocturnal, Crepuscular
Diet Carnivore Adult stage: small mammals (rodents) are the most commonly targeted and energetically profitable prey; juvenile stage: small lizards (geckos/skinks) are frequently taken where abundant.

Temperament

Generally non-social and avoidance-oriented; when approached or restrained, often defensive rather than affiliative (rapid striking, persistent biting, and tight coiling around perches are commonly reported).
Strong sit-and-wait (ambush) tendency with extended immobility on a chosen branch perch; disturbance often triggers a defensive S-shaped neck posture and head tracking of threats.
Ontogenetic/individual variation is common: juveniles are frequently described as more reactive/defensive than adults, while adults often rely more on crypsis and remaining motionless until very closely approached (field and husbandry observations).
Breeding females may show heightened defensiveness while brooding eggs (maternal attendance increases defensive responses around the clutch).

Communication

Hissing Expelled-air threat display; snakes lack vocal cords, so this is a non-vocal sound used as a defensive warning
Chemical communication via tongue-flicking and pheromone detection Courtship/mate-tracking relies heavily on chemical cues typical of snakes; males investigate female scent trails and cloacal cues
Tactile communication during courtship: body alignment, cloacal contact, and rubbing/pressing behaviors facilitate mating; males may maintain contact while attempting copulation.
Postural/visual signaling (at close range): defensive neck retraction (S-curve), head elevation, and body coiling on the perch can function as threat displays; coloration is primarily cryptic/anti-predator rather than a known social signal.
Substrate vibration/physical presence cues: individuals respond to nearby movement through branch vibrations and air movement, influencing defensive readiness and retreat/strike decisions.

Habitat

Biomes:
Tropical Rainforest Wetland Tropical Dry Forest
Terrain:
Mountainous Hilly Valley Coastal Island Riverine
Elevation: Up to 6561 ft 8 in

Ecological Role

Arboreal mesopredator in New Guinea and nearby island forests, linking canopy/edge small-vertebrate communities to higher trophic levels.

Population control of small mammals (including rodents) and small birds in forest and forest-edge habitats Transfers energy from small vertebrates to larger predators/scavengers via being occasional prey (e.g., large raptors and other predators) Contributes to structuring arboreal food webs through size-based (ontogenetic) shifts in prey selection

Diet Details

Main Prey:
Small mammals Small arboreal marsupials Birds Bats Small reptiles Amphibians

Human Interaction

Domestication Status

Wild

Morelia viridis (Green Tree Python) is a wild, not domesticated snake from New Guinea, nearby islands (Misool, Salawati) and Australia’s Cape York. People meet it during research, buy it in the pet trade (now mostly captive-bred), and sometimes kill it out of fear. Listed CITES Appendix II; IUCN Least Concern.

Danger Level

Low
  • Nonvenomous but can deliver painful defensive bites (notably long teeth adapted for gripping prey); risk of laceration
  • Secondary infection risk from bites without proper wound care
  • Handling stress can provoke repeated striking; safer husbandry relies on minimal handling and appropriate tools

As a Pet

Suitable as Pet

Legality: Morelia viridis is often legal if captive-bred but regulated. International trade needs CITES Appendix II permits. Local rules vary—some places (e.g., Australia) ban or tightly limit keeping; check permits and laws.

Care Level: Experienced

Purchase Cost: $400 - $3,000
Lifetime Cost: $6,000 - $20,000

Economic Value

Uses:
Companion animal / herpetoculture (pet trade) Captive breeding and specialty morph market Education and zoological display Ecotourism / wildlife viewing (limited, niche)
Products:
  • Captive-bred animals sold in the pet market
  • Husbandry services/supplies (arboreal enclosures, thermostatic heating, humidity control)
  • Educational programming and exhibits featuring arboreal python ecology

Relationships

Predators 5

Papuan Eagle Harpyopsis novaeguineae
Brown Goshawk Accipiter fasciatus
Salvadori's Monitor
Salvadori's Monitor Varanus salvadorii
Green Tree Monitor
Green Tree Monitor Varanus prasinus
Human
Human Homo sapiens

Though the green tree python is relegated to a relatively localized population in and around Oceania, their distinctively bright green appearance and interest from amateur snake enthusiasts have transformed them into increasingly popular pets. Despite that, these are wild and cunning snakes whose reputation for being aggressive is rooted in an inherent shyness towards humans. Through a combination of trickery and patience, these snakes manage to sate their appetites for mammals and reptiles while rarely having to leave the treetop canopies they call home. And the ostentatious green coloration of these snakes is actually a camouflage mechanism that helps them conceal themselves more capably in rainforest habitats.

3 Amazing Green Python Facts

  • The gestation period for females can last up to 90 days, and they don’t eat at all during this period of time.
  • Adolescents of the species can appear in shades ranging from brilliant neon yellow to brick red.
  • Though they look virtually indistinguishable from South America’s emerald tree boa in appearance, these snakes are the result of convergent evolution.

Where To Find the Green Tree Python

Green tree pythons are found only in Australia and nearby islands like New Guinea and Indonesia. Despite this narrow population distribution, some variations like the Biak green tree python are limited to a very narrow geographic range — in this case, a relatively small region within Papua. As their coloring would suggest, these snakes prefer vibrant rainforest habitats, although they may be discovered in less wet forests as well as in territories of fresh growth.

Age is actually a major factor in the type of habitat these snakes prefer. Adolescent snakes prioritize forests with less dense canopies since sunlight can reach them more easily and provide them with the warmth they need. As they mature, these snakes tend to develop more patient hunting methods that can better conserve energy and thus move to areas with thicker canopies that can provide better protection from predators.

As more people begin to keep these pythons as pet snakes, it’s possible their location range will expand significantly. Unfortunately, it’s hard to know the price specific ecosystems would end up paying for the introduction of these cunning albeit nonvenomous predators into the wild.

Green Tree Python Scientific name

The green tree python doesn’t have any other common pseudonyms, but its scientific name is Morelia viridis. The Latin is rather mundane and literal. Viridis is Latin for green and refers to the coloring of the snake, while Morelia is the name of the genus that these snakes belong to. All eight of the snakes in this genus are predators known for their large size and location range limited to Oceania.

Green Tree Python Population & Conservation Status

In the wild, green tree pythons are small in terms of both population size and geographic range — but they’re considered by the UICN to be a species of least concern. Though their range may be isolated by the remoteness of Australia and nearby island chains, their population size has remained consistent over the years. But the facts show that these reptiles are being sold as pet snakes throughout the world, and so close monitoring is important to ensure quick identification if the threat levels change.

How To Identify Green Tree Pythons: Appearance and Description

The easiest point of identification for the green tree python is the brilliant green hue of an adult’s body, but it’s not their only distinguishable feature. Their colors are enhanced by narrow yellow and white stripes that extend down their vertebrae. Identification between different members of this species can also be assisted by the fact that some express dots and other markings on their bodies in blue or yellow colors. The heads of these snakes resemble a diamond, and adults will grow to sizes of approximately five feet about a year into their lifespan.

How to identify a Green tree python:

  • Bright green coloration with yellow or white vertebral stripes
  • A diamond-shaped head
  • A length of roughly five feet from nose to tail

When Do Green Tree Pythons Turn Green?

Hatchlings typically display colors that are dramatically different from the bright green they’re recognized for as adults. Bright yellow and brick red are both common, and these colorations have developed to provide them with better camouflage in the open-canopy forests they tend to inhabit. They won’t develop their trademark green and yellow colors until they reach the age of six months to a year.

Types of Green Tree Python

Though they occupy a relatively small geographic area, these pythons can actually appear in a number of different colors and patterns depending on where they live. In many cases, these mutations happened because of the isolated nature of the islands where these snakes live. Here are some of the most beautiful and common localities.

  • Biak green tree pythons are the biggest locality, and many don’t reach their adult coloration until they’re five years old. When they do, they often retain much of the bright yellow coloration they had as hatchlings. The Biak green tree python is one of the most popular morphs for a pet snake, and it has a more curious temperament by nature.
  • Jayapura green tree pythons are also popular as pets because they’re less likely to bite than other localities. Though generally similar to other members of their species, the presence of a blue — rather than yellow or white — vertebral stripe makes identification simple. They also commonly express white splotches across their body.
  • Blue is actually the dominant color for the Manokwari. While their bodies appear as a lighter green color, the stripe going down their spine is thicker and vibrantly blue. Those blue accents also appear on the tail, becoming more prominent towards the tip.

Green Tree Python Pictures

Green tree python (Morelia viridis) snake, native to New Guinea and Indonesia. Green tree pythons have over 100 long, sharp, backward-pointing teeth designed to bite into prey and hang on.

Green tree python (Morelia viridis) snake, native to New Guinea and Indonesia. Green tree pythons have over 100 long, sharp, backward-pointing teeth designed to bite into prey and hang on.

Green Tree Python (Morelia viridis) coiled in a tree. Adults will grow to sizes of approximately five feet.

Green Tree Python (Morelia viridis) coiled in a tree. Adults will grow to sizes of approximately five feet.

Juvenile Green Tree Python. Adolescents of the species can appear in shades ranging from brilliant neon yellow to brick red.

Juvenile Green Tree Python. Adolescents of the species can appear in shades ranging from brilliant neon yellow to brick red.

Green Tree Pythons: How Dangerous Are They?

These pythons are nonvenomous and normally don’t pose a danger to humans. In the wild, these snakes will usually keep to themselves — but if they’re kept as pet snakes, inadequate enclosure size can change the facts and back them into attacking. And being nonvenomous doesn’t change the fact that these snakes have over 100 teeth. A bite from this snake can often result in the price of an emergency room bill. Enclosure size should always be a priority when keeping them as pet snakes, but green tree pythons should also only be kept by experienced handlers due to their complicated temperaments.

Green Tree Python Behavior and Humans

While their vibrant colors have made these pythons a popular choice to be kept as a pet, these are still challenging reptiles that can be elusive even by the standards of other popular reptilian pets. The needs in terms of diet, location, and general care are similar to most snake species — but they don’t like to be held and aren’t afraid to bite if someone gets too close.

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Sources

  1. Animal Diversity Web / Accessed January 25, 2022
  2. ITIS / Accessed January 25, 2022
  3. Racine Zoo / Accessed January 25, 2022
  4. Snakes For Pets / Accessed January 25, 2022
  5. Reptiles / Accessed January 25, 2022
A-Z Animals Staff

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Green Tree Python FAQs (Frequently Asked Questions)

Green tree pythons can be found throughout Australia, Indonesia, and Papua New Guinea. You can find different variations of this species depending on which island you visit.